Proinvasive properties of ovarian cancer ascites-derived membrane vesicles

被引:206
|
作者
Graves, LE
Ariztia, EV
Navari, JR
Matzel, HJ
Stack, MS
Fishman, DA
机构
[1] Northwestern Univ, Feinberg Sch Med, Dept Cell & Mol Biol, Chicago, IL USA
[2] NYU, Sch Med, Dept Obstet & Gynecol, New York, NY USA
关键词
D O I
10.1158/0008-5472.CAN-04-1800
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Malignant ovarian ascites are rich in cellular components, membrane-bound vesicles, and soluble proteins. This study focused on the structure of membrane-bound vesicles and their ability to promote invasion in cultured malignant ovarian epithelium. Membrane vesicles were derived from women with stage I-IV malignant ovarian ascites and from nonmalignant gynecologic ascites. Isolated vesicles were characterized by immunofluorescence and Western blot analysis. Using gel zymography for matrix metalloproteinase (MMP) detection and a colorimetric assay for urokinase-type plasminogen activator (uPA) analysis, we analyzed the proteinase activities of MMP-2, MMP-9, and uPA from the prepared vesicles, whole cells isolated from ascites, and the cell-free ultracentrifuged supernatant. The invasiveness of established cultured malignant ovarian epithelium on addition of ascites-derived vesicles was tested using a Matrigel-based invasion assay. Fractionation of malignant ascites revealed that extracellular matrix-degrading proteinases including MMPs and uPA are localized preferentially in membrane vesicles. All malignant vesicles tested, regardless of cancer stage, stimulated invasion. Furthermore, the combination of ovarian cancer cells and membrane vesicles resulted in greater uPA activation than that of cells or vesicles alone. Membrane vesicles from malignant ascites were also found to contain activated MMP-2, MMP-9, and uPA. Our data suggest that vesicle-stimulated proteinase activation leads to increased extracellular matrix degradation, which may facilitate tumor cell invasion and metastasis.
引用
收藏
页码:7045 / 7049
页数:5
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